¿What isolated HB driver do you recommend me?

Hello, I working in redesing the high voltage supply for Precipitator electrostatic, now I have a desing with half bridge driver (IR2153) with 2 MosFET this switching to 20-25kHZ that supply 2 transformers HV, I have outputs the up 40 kV.I want redesing the supply, change the MosFETs by IBGTs, and I am thinking change the IR2153 (resistive switching control) by a HB driver (PWM), I found it interesting to use your Isolated HB driver, controlled by ATMEGA328p. I will use FGH40N60UFD (IGBT), ¿what isolated HB driver do you recommend me? I interesting in ADUM4223.

The ADuM4223 is a good choice. Do you have a target 1 minute withstand voltage rating in mind? The ADuM3223 is electrically the same as the ADuM4223, but in a smaller package and lower withstand voltage. This might be able to save you board space if space is tight.

The ADuM7223 is another half bridge driver that could be a good choice. It is in an LGA package, and if layout area is a large concern, This is the smallest isolated half bridge driver ADI offers.

The ADuM4223 is a good choice. Do you have a target 1 minute withstand voltage rating in mind? The ADuM3223 is electrically the same as the ADuM4223, but in a smaller package and lower withstand voltage. This might be able to save you board space if space is tight.

The ADuM7223 is another half bridge driver that could be a good choice. It is in an LGA package, and if layout area is a large concern, This is the smallest isolated half bridge driver ADI offers.

The withstand rating is one of the insulation ratings related to safety. If something goes wrong, the isolation barrier is able to hold the voltage off safely for at least the rated time. If you are seeking to create a system with a target withstand voltage, all components would have to be at least rated to that, and you would refer to the specific certification standard for other rules. One common requirement for a given withstand voltage is how far apart the different isolation regions are from each other. Here is a short video talking about creepage and clearance and insulation in general.

If you are just looking to protect your system from potential noise or damage, isolation can also be talked about in a functional sense rather than safety. For half bridges, this is what allows the primary side to be talking to the part referenced to the controller ground, while the high-side ground (usually GNDA on the ADuM3223/4223) is allowed to swing up and down to the bus voltage with the half-bridge voltage. The iCoupler family of gate drivers is different from the high voltage level shifter your earlier design is using in that galvanic isolation is achieved between the isolation regions using transformers, rather than a large resistor that communicates within the chip.

The ADuM3223 and ADuM4223 both use the same isolation barrier. The difference in the withstand ratings comes from the physical package dimensions, and the relevant safety standard applied to them. Each of these chips are individually tested in production using an accelerated withstand high voltage screening process.

Gate drive signals are sensitive to parasitic inductances, and tight layout is required for optimal performance. Keeping the gate driver close to the IGBT you will be driving is a must. An external series gate resistor is also mandatory in most applications. If you observe a lot of ringing on the gate signal, you can try increasing the external series gate resistor to damp the system more. I mention this because you mention using a breakout board, which will increase parasitic inductances.

The ADuM4223 will need a high side power supply. Your previous design uses a bootstrap setup, which can also be done with ADuM4223. There is figure in the datasheet that shows how to accomplish this:

Also, here is an article about powering the high side, in case the bootstrap frequency and duty cycle limitations get in the way of your design:

Yes, I understand. One of the benefits of isolated gate drivers is that you can more easily have high current paths not interact with the power current paths. This is an example of functional isolation, so you are free to use any package that you feel comfortable working with. The ADuM4223 is a good choice for this project.